» How They Work
How Our Impact Attenuators Work
Our patented compression system is a dual compression system that was crash tested by the MGM Research lab in Wisconsin back in 2005..
There are 2 large outside rubber compression springs that you can see compress in the video. But there are also 4 internal springs inside the shank.
When you get hit in the rear, the two large absorbers push against the outside of the receiver hitch and the 4 internal rubber springs push against the hitch pin.
The animation below shows how they work. This system can be smashed over and over again but it's always a good idea to check the welding and the compression system after any impact.
Rubber compression springs work at a "variable compression rate"; ie the more they compress the stronger they get.
After the absorbers have done their job the tube itself will start to crush absorbing more of the crash energy. This takes about a 8-12 mph impact. Actual customer picture and testimonial below.
Jeff: I just want to let you know my wife was rear ended while out of town last week with the Sparebumper installed on our Toyota 4Runner.
It was enough to cave in the tube some but no other damage to the vehicle or her. She was hit in a construction area at a stop light by a guy not paying attention.
I figure I just saved my $1000 deductable and frustration at the body shop! I would be glad to send you a picture of it still on the vehicle.
Everyone wondered about that on the back of her vehicle and now they all say that's a good investment!
I am going to try to submit this to the NSRA too as a good product for other street rod members especially the way you have handled this for me so fairly. Paul, Oklahoma.